ACC vs United States Air Force

ACC and United States Air Force both are nouns.

Word	Noun	Adjective	Verb	Adverb
ACC	Yes	No	No	No
United States Air Force	Yes	No	No	No

ACC (noun)	United States Air Force (noun)
a command that is the primary provider of air combat weapon systems to the United States Air Force; operates fighter, bomber, reconnaissance, battle-management, and rescue aircraft	the airforce of the United States of America; the agency that defends the United States through control and exploitation of air and space